Magnum-energy MS Series User Manual download pdf (Page 30)

Installation

2.5 AC Wiring

This section provides information on how to make the AC connections to the inverter using the

correct AC wire size and corresponding overcurrent protection.

2.5.1 Pre-AC Wiring Requirements

CAUTION: Before installing any AC wiring, review the safety information at the

beginning of this manual and the following to ensure a safe and long-lived system:

• Always use properly rated circuit breakers. If using an electrical sub-panel, circuit

breakers can be moved from the main electrical panel to the sub-panel only if the

breakers are also listed to be installed in the sub-panel.

• AC wiring must be no less than #10 AWG (5.3 mm

) gauge copper wire and be

approved for the application (i.e., residential, RV, or marine wiring).

• DO NOT connect the inverter’s output to an AC power source. This could cause

severe damage to the inverter and is not covered under warranty.

• The wire sizes recommended in this manual are based on the ampacities given in

Table 310.16 (in conduit) or Table 310.17 (in free air) of the National Electrical Code.

ANSI/NFPA 70, for 75ºC (167ºF) copper wire based on an ambient temperature of

30ºC (86ºF).

WARNING: To reduce the risk of ﬁ re, do not connect this inverter to an AC load center

(circuit breaker panel) having multi-wire branch circuits connected.

Note

– On -15B and -20B models, the pass-thru current is limited by the inverter’s output breaker size.

Note

² – The -15B and -20B models have a single AC input and cannot be conﬁ gured for a 60-amp pass-thru

capability.

2.5.2 AC Wire Size and Overcurrent Protection

The AC input and output wiring must be sized per the local electrical safety code requirements

to ensure the wire’s ability to safely handle the inverter’s maximum load current. The AC wiring

must be protected from short circuits and overloads by an overcurrent protection device and have

a means to disconnect the AC circuits. AC overcurrent protection is not included in the inverter

and must be provided as part of the inverter installation. The AC overcurrent protection device

must be a circuit breaker or a fuse/disconnect and be properly sized and branch circuit rated for

the wire it is protecting and the appliances being powered.

Info: When wiring the AC input and output circuits, we highly recommend a full system

Inverter Bypass Switch. This simple item provides a convenient way to isolate the

inverter for battery maintenance, and it could save you hours of downtime—if you ever

need to service your inverter—by enabling you to continue to power your AC loads

without any re-wiring. Because we think it is an essential part of an inverter system,

every Magnum panel (MMP/MP Series) is equipped with an Inverter Bypass Switch.

When the inverter is in Standby mode, the full AC continuous pass-thru capacity of the MS Series

inverter/charger is 30 amps for each AC leg

(AC HOT 1 and AC HOT 2). For a 30-amp continuous

pass-thru capability, each AC HOT input to the inverter requires a 30-amp continuous duty rated

breaker², which corresponds to a minimum cable size of #10 AWG (in conduit). However, the AC

HOT 1 and AC HOT 2 may be combined to obtain a 60-amp pass-thru capability² (see Figure 2-10).

When tying the AC HOT 1 and HOT 2 together for a 60-amp continuous pass-thru capability, the

AC input to the inverter requires a 60-amp continuous duty rated breaker, which corresponds to

a minimum cable size of #6 AWG (in conduit). If you are using other circuit breakers/wire sizes,

refer to the appropriate electrical codes for sizing requirements.

CAUTION: The inverter’s internal AC transfer relay contacts are rated for 30 amps

(each leg), the pass-thru current for relay contact must be no greater than 30 amps

or damage to this relay may occur.

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Magnum-energy MS Series User Manual Page 30

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